The spontaneous formation and plasmonic properties of ultrathin gold–silver nanorods and nanowires stabilized in oleic acid

Crespo, Julián; López‐de‐Luzuriaga, José M.; Monge, Miguel; Olmos, M. Elena; Rodríguez‐Castillo, María; Cormary, Benoît; Soulantica, Katerina; Sestu, Matteo; Falqui, Andrea

doi:10.1039/c5cc05542c

Cited by 11 publications

(20 citation statements)

References 28 publications

(58 reference statements)

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“…The use of organometallic compounds as precursors constitutes a very interesting approach for the synthesis of metallic nanostructures. In the case of pentafluorophenyl derivatives of gold (I) and/or silver (I), the reduction of metals under very mild reaction conditions has allowed the preparation of new types of nanostructures such as ultra-fine nanorods or nanowires [ 33 ], ultra-small gold nanoparticles [ 34 ] or gold colloidosomes [ 35 ]. There are usually two decomposition mechanisms for these compounds, i.e., bimolecular reductive elimination or deprotonation of acidic ligands by means of the basic pentafluorophenyl ligand.…”

Section: Resultsmentioning

confidence: 99%

Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

2021

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Au-Ag/g-C3N4 nanohybrids 2–3 were synthesized by the one-pot self-reduction of the organometallic precursor [Au2Ag2(C6F5)4(OEt2)2]n in the presence of graphitic carbon nitride (g-C3N4), leading to two populations of alloyed Au-Ag nanoparticles (NPs) of different size and composition on the surface of g-C3N4, i.e., Ag-enriched Au-Ag NPs of smaller size and Au-enriched Au-Ag NPs of larger size. The combination of these two types of plasmonic NPs with g-C3N4 semiconductor displays enhanced photocatalytic properties towards the degradation of ibuprofen under visible light by the increased charge carrier separation provided by the inclusion of the plasmonic NPs on g-C3N4.

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Section: Resultsmentioning

confidence: 99%

Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

2021

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“…[1][2][3] The structure of BMNPs is dened by the distribution modes of two elements that can be oriented in different ways including a random alloy or an alloy with an inter-metallic compound, cluster-in-cluster and core-shell structure. [3][4][5] Therefore, synthesis of BMNPs with controlled morphology and composition are the important tasks for the researchers. [3][4][5] Therefore, synthesis of BMNPs with controlled morphology and composition are the important tasks for the researchers.…”

Section: Introductionmentioning

confidence: 99%

Tuning the composition of gold–silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

2016

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This paper reports the synthesis of gold-silver bimetallic nanoparticles (Au-AgNPs) with different Ag : Au compositions in an aqueous medium and their attachment on a glassy carbon electrode (GCE) via a 1,6-hexadiamine (HDA) linker for the electrochemical reduction of hydrogen peroxide (HP) and nitrobenzene (NB). Initially, silver nanoparticles (AgNPs) were synthesized by the reduction of silver nitrate using trisodium citrate as a capping agent and sodium borohydride as a reducing agent. Then, the Au-AgNPs were prepared by the galvanic displacement of Ag (0) by AuCl 4 À ions. The composition of the Au-AgNPs was varied by changing the mole ratio of Ag : Au in the range of 1 : 0 to 1 : 0.16. TEM images show that the Au-AgNPs were spherical in shape with a diameter of $16 nm. The prepared colloidal solution of Au-AgNPs were then attached on a HDA modified GCE through the Michael's addition reaction and were confirmed by UV-vis diffuse reflectance spectroscopy (DRS), atomic force microscopy (AFM), line scanning analysis, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The AFM image shows that the Au-AgNPs were densely packed on the electrode surface. The Au-AgNPs modified electrode exhibits a higher heterogeneous electron transfer rate constant of 2.77 Â 10 À7 cm s À1 when compared to Ag and AuNPs modified electrodes. Furthermore, the electrocatalytic activity of the Au-AgNPs modified electrode was examined by studying the reduction of HP and NB. It was found that the Au-AgNPs with the Ag : Au mole ratio of 1 : 0.12 showed excellent electrocatalytic activity towards the reduction of both HP and NB by not only shifting their reduction potentials toward less negative potentials but also enhanced their currents compared to the bare GCE, Ag and AuNPs modified electrodes and Au-AgNPs of other molar ratios. The present modified electrode shows the limit of detection of 0.12 and 0.23 mM (S/N ¼ 3) for HP and NB, respectively.Fig. 3 AFM images obtained for (A and B) 2-D and (C and D) 3-D views of AgNPs and Au-AgNPs, modified substrates. (E and F) Line spectra obtained for Au-AgNPs and CV obtained for GC/HDA/Au-AgNPs (Ag : Au ¼ 1 : 0.12) electrode in 0.2 M PB solution (pH 7.2) at a scan rate of 50 mV s À1 . 63438 | RSC Adv., 2016, 6, 63433-63444This journal is

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“…55 Monge and Soulantica reported the formation of Au-Ag alloy UNRs (diameter ³ 2 nm) with lengths in the range of 2050 nm via spontaneous decomposition of the precursor [Au 2 Ag 2 (C 6 F 5 ) 4 (OEt 2 ) 2 ] n in oleic acid (Figure 9b). 56 Kawai successfully reduced the length of Au-Ag alloy UNRs less than ³200 nm range by increasing the molar ratio of C18AA with respect to metal precursors. 57 Tsukuda reported a facile method to control the length over a wide range (from a few to a few hundred nm) while retaining a diameter smaller than 2 nm; the fundamental protocol is the slow reduction of Au(I) ions by TIPS in the presence of different concentrations of OA and the removal of the AuNSs impurities by precipitation.…”

Section: Ultrathin Gold Nanorodsmentioning

confidence: 99%

“…Representative TEM images of (a) AuUNRs prepared using FeNSs as reductant,55 (b) Au-AgUNRs,56 (c)(f ) OAstabilized AuUNRs with average lengths of 5.2, 8.7, 13, and 24 nm 58. Black bar in (b): 20 nm 56. Reprinted with permissions from refs 55, 56 and 58.…”

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confidence: 99%

Ultrathin Gold Nanowires and Nanorods

Takahata

Tsukuda

2019

Chem. Lett.

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moving to the University of Tokyo in 2011. His research interest is focused on size-selected synthesis and gas-phase characterization of atomically-precise metal clusters and their catalytic application. Ryo Takahata got his PhD degree in 2018 from the University of Tokyo on the control synthesis and characterization of ultrathin gold nanorods under the supervision of Prof. Tsukuda. In 2018, he joined the research group of Prof. Toshiharu Teranishi at Institute of Chemical Research, Kyoto University as a postdoctral fellow of the Japan Society for the Promotion of Science. His current research interests are precise synthesis of nanostructured materials and elucidation of their optical properties.

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The spontaneous formation and plasmonic properties of ultrathin gold–silver nanorods and nanowires stabilized in oleic acid

Cited by 11 publications

References 28 publications

Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

Combination of Au-Ag Plasmonic Nanoparticles of Varied Compositions with Carbon Nitride for Enhanced Photocatalytic Degradation of Ibuprofen under Visible Light

Tuning the composition of gold–silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

Ultrathin Gold Nanowires and Nanorods

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